/**
 * easyui 前台分页
 */
function pagerFilter(data){
           if (typeof data.length == 'number' && typeof data.splice == 'function'){    // 判断数据是否是数组
               data = {
                   total: data.length,
                   rows: data
               }
           }
           var dg = $(this);
           var opts = dg.datagrid('options');
           var pager = dg.datagrid('getPager');
           pager.pagination({
               onSelectPage:function(pageNum, pageSize){
                   opts.pageNumber = pageNum;
                   opts.pageSize = pageSize;
                   pager.pagination('refresh',{
                       pageNumber:pageNum,
                       pageSize:pageSize
                   });
                   dg.datagrid('loadData',data);
               }
           });
           if (!data.originalRows){
               data.originalRows = (data.rows);
           }
           var start = (opts.pageNumber-1)*parseInt(opts.pageSize);
           var end = start + parseInt(opts.pageSize);
           data.rows = (data.originalRows.slice(start, end));
           return data;
       }